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1 jermar 1 
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <arch/mm/page.h>
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#include <genarch/mm/page_pt.h>
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#include <arch/mm/frame.h>
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#include <mm/frame.h>
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#include <mm/page.h>
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#include <mm/as.h>
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#include <arch/types.h>
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#include <align.h>
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#include <config.h>
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#include <func.h>
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#include <arch/interrupt.h>
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#include <arch/asm.h>
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#include <debug.h>
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#include <memstr.h>
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#include <print.h>
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#include <interrupt.h>
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void page_arch_init(void)
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{
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    __address cur;
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    int flags;
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    if (config.cpu_active == 1) {
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        page_mapping_operations = &pt_mapping_operations;
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        /*
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         * PA2KA(identity) mapping for all frames until last_frame.
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         */
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        for (cur = 0; cur < last_frame; cur += FRAME_SIZE) {
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            flags = PAGE_CACHEABLE;
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            if ((PA2KA(cur) >= config.base) && (PA2KA(cur) < config.base + config.kernel_size))
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                flags |= PAGE_GLOBAL;
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            page_mapping_insert(AS_KERNEL, PA2KA(cur), cur, flags);
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        }
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        exc_register(14, "page_fault", (iroutine) page_fault);
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        write_cr3((__address) AS_KERNEL->page_table);
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    }
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    else {
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        write_cr3((__address) AS_KERNEL->page_table);
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    }
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    paging_on();
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}
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__address hw_map(__address physaddr, size_t size)
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{
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    if (last_frame + ALIGN_UP(size, PAGE_SIZE) > KA2PA(KERNEL_ADDRESS_SPACE_END_ARCH))
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        panic("Unable to map physical memory %p (%d bytes)", physaddr, size)
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    __address virtaddr = PA2KA(last_frame);
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    pfn_t i;
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    for (i = 0; i < ADDR2PFN(ALIGN_UP(size, PAGE_SIZE)); i++)
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        page_mapping_insert(AS_KERNEL, virtaddr + PFN2ADDR(i), physaddr + PFN2ADDR(i), PAGE_NOT_CACHEABLE);
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    last_frame = ALIGN_UP(last_frame + size, FRAME_SIZE);
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    return virtaddr;
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}